You're practically getting one free, so stock up and get a great deal! CatGenie SaniSolution 120 Fresh Scent. Exclusively for use in the. CatGenie Self-Flushing, Self-Washing Cat Box. The item "CATGENIE SANISOLUTION 120 FRESH SCENT 6-PACK CARTRIDGES, NO TAX, FREE shipping" is in sale since Sunday, December 31, 2017.